Grokking System Design Fundamentals
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Trade-offs in CAP Theorem
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Now let's discuss the heart of CAP: the trade-offs. Why can’t a distributed system have Consistency, Availability, and Partition tolerance all at once? The simple answer: when a network partition happens, the system has to make a tough choice:

  • If the system decides to remain consistent (C), it cannot allow conflicting updates on different sides of the partition. So at least one side of the partition must stop accepting operations (to avoid divergence). That means some part of the system becomes unavailable (not serving requests)

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